While trying to compile the source, I had to make quite a few changes to the #include statements. These are the changes I made: In file zeroballistics/branches/demo-1.1/libs/toolbox/src/RegisteredFpGroup.h #include <string>

The real cause for this error is g++'s policy to ignore system include dirs. If a CEGUI dev package is installed, the (hardcoded) include path points to exactly such an dir and is therefore ignored. Creating a symlink into the source-folder and changing the cmake configuration solves this problem.

Markus

Edit: This needs to be done with bluebeard/CMakeLists.txt and games/tank/CMakeLists.txtEdit2: And tools/{model|particle]viewer/CMakeLists.txt